Development of Capabilities of Optical Diffraction Analysis for Quantitatively Comparing and Correlating Rock Fabrics and Fabric Changes

摘要

Standard uniaxial loading of rock specimens and cantilever and third-part loading of rock slices cemented to aluminum beams have provided input data. Fabrics of rock specimens undergoing deformation have been recorded photographically in white light, in ultra-violet illumination after treatment of specimens with fluorescent dye penetrants, and with acetate peels. These fabric pictures have been converted to their two-dimensional Fourier amplitude transforms by optical diffraction. Changes in the transforms reflect spatial changes in the fabrics with loading. Transforms have been produced from petrographic thin sections using a modified laboratory microscope and partially coherent light; this technique promises wider application of optical diffraction analysis in petrofabric studies. An extensive collection of reference inputs and their transforms has been prepared. (Modified author abstract)